The Java concurrency API provides a synchronizing utility that allows the synchronization of two or more threads at a determined point. It's the CyclicBarrier class. This class is similar to the CountDownLatch class explained in the Waiting for multiple concurrent events recipe in this chapter, but it presents some differences that make it a more powerful class.
The CyclicBarrier class is initialized with an integer number, which is the number of threads that will be synchronized at a determined point. When one of these threads arrives at the determined point, it calls the await() method to wait for the other threads. When the thread calls this method, the CyclicBarrier class blocks the thread that is sleeping until the other threads arrive. When the last thread calls the await() method of the CyclicBarrier object, it wakes up all the threads that were waiting and continues...
